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The Overmind created a new cerebrate whose sole purpose was to protect the chrysalis.

Daggoth of the Tiamat Brood taught the young cerebrate how to construct and maintain a hive cluster. Then Zasz, another cerebrate, of the Garm Brood informed the new cerebrate of a small band of Terran Confederacy remnants in the area. The young cerebrate was ordered to destroy these terrans in order to ensure the safety of the chrysalis and the hive cluster. The young cerebrate easily defeated the terrans. The Overmind stated, "I am well pleased young Cerebrate, and so long as my prize remains intact, I shall remain pleased. Thus, its life and yours shall be made as one. As it prospers, so shall you."[1]

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The new cerebrate was informed that the Overmind could reincarnate it if "ever its flesh should fail."

The Overmind decided to travel to Char in order to keep the chrysalis safe, but doing so required the zerg to clear a space platform over Tarsonis of the remnants of Tassadar's forces. With help from Daggoth's Hunter Killers (specialized hydralisks), the protoss forces were beaten and scattered.

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As soon as the chrysalis arrived, it began to create problems. It had grown much larger and was creating powerful psionic emanations, directed at Jim Raynor and Emperor Arcturus Mengsk[3] for reasons that were, at the time, undisclosed.

Mengsk sent General Edmund Duke with his Alpha Squadron to Char with orders to eliminate any zerg found there. Zasz was able to intercept Duke's communications and relay them to the Overmind.

Although the terrans here were stronger than the ones it had faced on Tarsonis, the new cerebrate was still able to achieve victory. This forced Duke to retreat, but he remained nearby. Daggoth ordered the cerebrate not to pursue,[4] as he and his Tiamat Brood would deal with the remainder of Alpha Squadron. The new cerebrate was instead ordered to relocate the chrysalis to a more secure location.[5]

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Raynor's Raiders arrived just as the chrysalis was about to hatch. The zerg once again was able to repel the terran opposition until Kerrigan emerged from the chrysalis. She quickly fell upon the terrans but allowed Raynor to leave with his life.[7]

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Kerrigan was created as part of the Overmind's plan to use psionic terrans to help him conquer the protoss. Unfortunately, her psionic power had been weakened by the ghost conditioning she had undergone, which was so powerful it had survived the zerg transformation process.

Kerrigan set out to solve this problem. She believed she only needed to collect information on the ghost conditioning process to relieve her condition. This information could be found on the Terran Dominionscience vessel, the Amerigo. Zasz was displeased by her plan, as it was risky, and if she died, the Overmind's efforts to acquire and transform her would be wasted. Kerrigan had retained the majority of her spirit, however, and ignored his advice.[8]

Aboard the Amerigo, she was accompanied by two of Daggoth's Hunter Killers. She fought the internal security forces, defeating them and even rescuing some zerglings that the terrans were experimenting on. Finally, she found the appropriate computer terminal and downloaded the information.[9]

After Kerrigan left, a team of Terran Dominion soldiers boarded the now-derelict Amerigo on a mission to destroy it. They brought a secure casket containing a thermonuclear charge in a bed of ice and cans of Happy Jack's Ale. Enjoyment of the beverages was interrupted when the first casualty was impaled through the head by a hydralisk and lifted toward the ceiling. Not long after additional hydralisks attacked from all directions. Realizing there was no escape and that they would soon be overrun the terrans activated the bomb. The ship was destroyed.[10]

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Kerrigan defeated the ghost conditioning and her powers increased, allowing her to conjure psionic storms. She was also able to detect the presence of protoss on the planet. Tassadar contacted her and, after exchanging a few insults, they agreed to battle. However, Zasz had detected something unusual about this protoss, and told Kerrigan she should hold off her attack. Again, Kerrigan would not follow his advice.[11]

Kerrigan's forces disposed of the protoss base, and she moved to a central island to challenge Tassadar to single combat. Unfortunately for her, Tassadar had only left an illusion as a distraction. Tassadar told her that as long as she was so predictable, she was her own worst enemy.[12]

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Daggoth informed Kerrigan that Zasz had died while her forces had fought with Tassadar's.

Kerrigan assumed the Overmind would reincarnate Zasz, but Daggoth told her the Overmind had been somehow paused by the strange way Zasz had been killed, and could not speak. Meanwhile, Zasz's now leaderless Garm Brood was running amok, and threatened the hive cluster.

The junior cerebrate was ordered to use its forces to destroy the Garm Brood, while Daggoth dealt with the protoss himself. The junior cerebrate successfully eradicated the rogue brood before it could do any further damage to the Swarm.[13]

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With the destruction of the Garm Brood, the Overmind awoke and related some very important information. Zasz had been slain by DarkPrelateZeratul. Dark Templar used cosmic energies similar to those of the Overmind, and so the Overmind could not reincarnate a cerebrate that had been killed by this method. They could also bend light around themselves, making them virtually invisible. However, overlords were capable of sensing their presence and leading troops to attack them.

When Zeratul stabbed Zasz with his warp blade the Overmind could briefly read the mind of the assassin. From Zeratul the Overmind learned the precise location of Aiur.[14]

Instead of following its original plan to send Kerrigan to Aiur to help conquer the protoss, she was tasked with hunting down and killing the Dark Templar. Kerrigan tracked down the main protoss base on Char and surrounded the escape routes with overlords, who could detect them. Then the zerg moved in, destroying the base and the protoss within. However, neither Tassadar nor Zeratul were present. Still, after this battle, the Expeditionary Fleet was virtually destroyed. Tassadar, Zeratul, and a small amount of warriors were all that remained.[15]

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The Overmind promptly launched its invasion force onto Aiur, with the assistance of many cerebrates, including its newest one. The Overmind's attack was not mindless, however. It ordered the new cerebrate to acquire a khaydarin crystal without revealing any reason for doing so. The force that defended the crystals, called the "Vanguard of Aiur", was much larger than the Expeditionary Force that the zerg had fought before. Nonetheless, the zerg defeated the Vanguard of Aiur and acquired the crystal.[17]

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Finally, the Overmind was willing to reveal its plan to the junior cerebrate. It had been created by the xel'naga, just like the protoss, and was going to add the protoss to the Swarm as it had done to many previous species it had encountered. However, the protoss had a powerful purity of form, just as the zerg had a powerful purity of essence. Adding protoss to the Swarm would give the zerg purity of both form and essence. The Overmind felt this would make the zerg "perfect".

In order to physically manifest on Aiur, the Overmind needed to establish itself on the spot in which the xel'naga first set foot on Aiur, found underneath a temple.[18] To do so, it needed the temple to be cleared and the khaydarin crystal set in its place.

The temple was a very important location for the protoss. Again, the Vanguard of Aiur defended this important resource, this time with help from the Ara Tribe, which acted as a reserve.

The zerg slowly forced their way towards the temple, destroying the protoss defenders. As they attacked the temple, the Ara Tribe launched its last desperate defense of it. It failed. The zerg cleared the temple area and implanted the khaydarin crystal.[19][20]

↑Zasz: "Though you be the favored servant of the Overmind, you would do well to remember that you are just a servant. You know of our grand mission, Kerrigan. Would you put your personal whims before the will of the Overmind?"Kerrigan: "Do not cross me, Zasz. I will do as I see fit, and not you or any other Cerebrate shall stand in my way."Overmind: "Let her go, Zasz. The greatness of her spirit has been left to her; that the Swarms might benefit from her fierce example. Fear not her designs, for she is bound to me as intimately as any Cerebrate. Truly, no Zerg can stray from my will, for all that you are lies wholly within me. Kerrigan is free to do as she desires." StarCraft. Vivendi Games. Level/area: The Amerigo (in English). 1998.

↑Kerrigan: "For the last time Zasz, you question my motives and authority at your own peril."Zasz: "You dare threaten a Cerebrate? You will be the doom of us all!" StarCraft. Vivendi Games. Level/area: The Dark Templar (in English). 1998.

↑Overmind: "Yet shall their overweening pride be their downfall. For when the assassin Zeratul murdered Zasz, his mind touched with mine, and all his secrets were made known to me. I have taken from his mind the secret location of Aiur, the Protoss Homeworld." StarCraft. Vivendi Games. Level/area: Eye for an Eye (in English). 1998.

↑Overmind: "Behold, there is a temple, not far from here, that lies upon ground most hallowed. Though I have born witness to the passing of countless millennia, the temple which you must assault is older by far. For it was constructed by my creators, the Xel'Naga, and it marks the site where the Xel'Naga first set foot upon Aiur." StarCraft. Vivendi Games. Level/area: Full Circle (in English). 1998.

↑Overmind: "Now shall the events set into motion so long ago be made complete. For the Protoss, too, were created by the Xel'Naga. They were the first creation, gifted with a purity of form. And we were the second creation, blessed with a purity of essence. Indeed, our two species are but opposite facets of a greater whole. Soon shall our two races be made as one." StarCraft. Vivendi Games. Level/area: Full Circle (in English). 1998.